Nobu-san: why was r37337 required and rb_w32_fstati64 no longer correct?

Heesob: good read. After reverting r37337 as per Hiroshi's comment, I get 0 fails on trunk@38966 (Win7 32bit + mingw-w64 4.7.2) because fstat -> rb_w32_fstati64 (win32/win32.c:4474) rather than fstat -> _fstati64 which causes mingw-w64 to use msvcrt's _fstat64 (i686-w64-mingw32/include/_mingw_stat64.h:12)